GB2022363A - Elctronic telephone circuit for subscriber-line - Google Patents
Elctronic telephone circuit for subscriber-lineInfo
- Publication number
- GB2022363A GB2022363A GB7917736A GB7917736A GB2022363A GB 2022363 A GB2022363 A GB 2022363A GB 7917736 A GB7917736 A GB 7917736A GB 7917736 A GB7917736 A GB 7917736A GB 2022363 A GB2022363 A GB 2022363A
- Authority
- GB
- United Kingdom
- Prior art keywords
- elctronic
- subscriber
- line
- telephone circuit
- telephone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
- H04M19/005—Feeding arrangements without the use of line transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT68269/78A IT1159706B (en) | 1978-06-02 | 1978-06-02 | USER LINE ELECTRONIC TELEPHONE CIRCUIT |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2022363A true GB2022363A (en) | 1979-12-12 |
GB2022363B GB2022363B (en) | 1982-06-16 |
Family
ID=11308779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7917736A Expired GB2022363B (en) | 1978-06-02 | 1979-05-22 | Elctronic telephone circuit for subscriber-line |
Country Status (12)
Country | Link |
---|---|
US (1) | US4287392A (en) |
JP (1) | JPS5853542B2 (en) |
BE (1) | BE876692A (en) |
BR (1) | BR7903166A (en) |
CA (1) | CA1114084A (en) |
CH (1) | CH634703A5 (en) |
DE (1) | DE2922271C2 (en) |
FR (1) | FR2427751A1 (en) |
GB (1) | GB2022363B (en) |
IT (1) | IT1159706B (en) |
NL (1) | NL7904313A (en) |
SE (1) | SE7904735L (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2502434A1 (en) * | 1981-03-20 | 1982-09-24 | Trt Telecom Radio Electr | Consumption reduction circuit for subscriber line equipment - uses opto-coupler to switch MOS transistor to add resistor to circuit when false call occurs |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4473719A (en) * | 1982-05-17 | 1984-09-25 | At&T Bell Laboratories | Switchhook status detector |
DE3237681C2 (en) * | 1982-10-12 | 1986-03-27 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Feed circuit for a variable consumer resistance and with differently acting output resistance |
JPS59122053U (en) * | 1983-02-03 | 1984-08-17 | エンネツ株式会社 | Warming machine for plant cultivation |
US4558183A (en) * | 1983-10-03 | 1985-12-10 | Cellutron Corporation | Opto-coupler interfacing circuit |
GB2287155B (en) * | 1994-02-23 | 1998-08-12 | Motorola Inc | Telecommunications device |
CA2146596C (en) * | 1994-04-29 | 1999-09-21 | Harry W. Moore, Iii | Loop current detector |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1199827B (en) * | 1964-05-21 | 1965-09-02 | Telefunken Patent | Circuit arrangement for the supply of the subscriber stations in telecommunication systems, especially telephone systems |
US3410961A (en) * | 1965-10-12 | 1968-11-12 | Bell Telephone Labor Inc | Line circuit for a telephone system having optical solid state means |
US3649769A (en) * | 1970-10-28 | 1972-03-14 | Gen Electric | Circuit for supplying direct current to a telephone line |
JPS4950860A (en) * | 1972-09-18 | 1974-05-17 | ||
CH586984A5 (en) * | 1974-12-23 | 1977-04-15 | Ibm | |
US3783194A (en) * | 1972-11-20 | 1974-01-01 | Milgo Electronic Corp | Data modem having a fast turn-around time over direct distance dialed networks |
US3848094A (en) * | 1972-12-29 | 1974-11-12 | Stromberg Carlson Corp | Telephone battery feed circuit |
FR2216733B1 (en) * | 1973-01-31 | 1978-05-12 | Labo Cent Telecommunicat | |
FR2254167B2 (en) * | 1973-12-10 | 1978-08-18 | Labo Cent Telecommunicat | |
FR2254168A1 (en) * | 1973-12-11 | 1975-07-04 | Ass Ouvriers Instr Precision | Telephone line supply device - is an active electronic device acting as resistance for direct current and high impedance for A.C. |
US3914556A (en) * | 1974-06-12 | 1975-10-21 | Itt | On-hook and off-hook detector for telephone switching systems |
US3955052A (en) * | 1974-11-18 | 1976-05-04 | Tadiran Israel Electronics Industries Ltd. | Subscriber unit particularly useful for time-division-multiplex system |
JPS5199408A (en) * | 1975-02-28 | 1976-09-02 | Hitachi Ltd | |
DE2534609C3 (en) * | 1975-08-02 | 1978-05-18 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Circuit arrangement for the central supply of subscriber stations in telecommunication systems, in particular telephone systems |
GB1563802A (en) * | 1975-11-10 | 1980-04-02 | Post Office | Electronic current feed circuit |
JPS5267504A (en) * | 1975-12-02 | 1977-06-04 | Oki Electric Ind Co Ltd | Speaking current supply and supervision system |
CH599731A5 (en) * | 1976-03-02 | 1978-05-31 | Ibm | |
DE2613590C2 (en) * | 1976-03-30 | 1977-10-27 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for evaluating changes in status on lines in telecommunication systems, in particular telephone systems |
JPS52142905A (en) * | 1976-05-24 | 1977-11-29 | Hitachi Denshi Ltd | Control device of telephone call current supply |
US4087646A (en) * | 1977-01-28 | 1978-05-02 | Bell Telephone Laboratories, Incorporated | Dual mode telephone subscriber loop current detector |
US4142075A (en) * | 1977-10-11 | 1979-02-27 | Burr-Brown Research Corporation | Interface circuit and method for telephone extension lines |
US4228323A (en) * | 1979-01-31 | 1980-10-14 | Bell Telephone Laboratories, Incorporated | Variable loop length compensated barrier circuit |
-
1978
- 1978-06-02 IT IT68269/78A patent/IT1159706B/en active
-
1979
- 1979-05-21 BR BR7903166A patent/BR7903166A/en unknown
- 1979-05-22 GB GB7917736A patent/GB2022363B/en not_active Expired
- 1979-05-22 CH CH479779A patent/CH634703A5/en not_active IP Right Cessation
- 1979-05-22 FR FR7912965A patent/FR2427751A1/en not_active Withdrawn
- 1979-05-22 CA CA328,048A patent/CA1114084A/en not_active Expired
- 1979-05-25 JP JP54064103A patent/JPS5853542B2/en not_active Expired
- 1979-05-30 US US06/043,848 patent/US4287392A/en not_active Expired - Lifetime
- 1979-05-30 SE SE7904735A patent/SE7904735L/en unknown
- 1979-05-31 NL NL7904313A patent/NL7904313A/en not_active Application Discontinuation
- 1979-05-31 DE DE2922271A patent/DE2922271C2/en not_active Expired
- 1979-05-31 BE BE0/195508A patent/BE876692A/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2502434A1 (en) * | 1981-03-20 | 1982-09-24 | Trt Telecom Radio Electr | Consumption reduction circuit for subscriber line equipment - uses opto-coupler to switch MOS transistor to add resistor to circuit when false call occurs |
Also Published As
Publication number | Publication date |
---|---|
SE7904735L (en) | 1979-12-03 |
JPS5853542B2 (en) | 1983-11-30 |
CH634703A5 (en) | 1983-02-15 |
US4287392A (en) | 1981-09-01 |
IT1159706B (en) | 1987-03-04 |
BR7903166A (en) | 1980-01-15 |
FR2427751A1 (en) | 1979-12-28 |
GB2022363B (en) | 1982-06-16 |
IT7868269A0 (en) | 1978-06-02 |
JPS54159114A (en) | 1979-12-15 |
DE2922271C2 (en) | 1983-02-24 |
BE876692A (en) | 1979-09-17 |
NL7904313A (en) | 1979-12-04 |
CA1114084A (en) | 1981-12-08 |
DE2922271A1 (en) | 1979-12-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |